diff --git a/modules/lib/d3.combobox.js b/modules/lib/d3.combobox.js
index c424b797c..c82be677f 100644
--- a/modules/lib/d3.combobox.js
+++ b/modules/lib/d3.combobox.js
@@ -241,7 +241,9 @@ export function d3combobox() {
         }
 
         function render() {
-            if (_suggestions.length >= _minItems && document.activeElement === input.node()) {
+            if (_suggestions.length >= _minItems &&
+                document.activeElement === input.node() &&
+                input.attr('readonly') === null) {
                 show();
             } else {
                 hide();